Home / 7,639.08-10,518.40-6,689.40

Finding the Fourth Proportional to 7,639.08, 10,518.40 and 6,689.40

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Solution

The fourth proportional to 7,639.08, 10,518.40 and 6,689.40 is: 9,210.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,639.08 : 10,518.40 = 6,689.40 : x
  2. Step 2: Convert to fraction form
    7,639.08/10,518.40 = 6,689.40/x
  3. Step 3: Cross multiply
    7,639.08x = 10,518.40 × 6,689.40
  4. Step 4: Simplify right side
    7,639.08x = 70,361,784.96
  5. Step 5: Solve for x
    x = 70,361,784.96/7,639.08
  6. Step 6: Final answer
    x = 9,210.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.